#include "EventLoopThread.h"
#include "EventLoop.h"

EventLoopThread::EventLoopThread(const ThreadInitCallback &cb,
                                 const std::string &name)
    : loop_(nullptr), exiting_(false), thread_(std::bind(&EventLoopThread::threadFunc, this), name), mutex_(), cond_(),
      callback_(cb) {
}

EventLoopThread::~EventLoopThread() {
    exiting_ = true;
    if (loop_ != nullptr) {
        loop_->quit();
        thread_.join();
    }
}

EventLoop *EventLoopThread::startLoop() {
    thread_.start(); // 启动底层的新线程

    EventLoop *loop = nullptr; {
        std::unique_lock<std::mutex> lock(mutex_);
        while (loop_ == nullptr) {
            cond_.wait(lock);
        }
        loop = loop_;
    }
    return loop;
}

// 下面这个方法，实在单独的新线程里面运行的
void EventLoopThread::threadFunc() {
    EventLoop loop; // 创建一个独立的eventloop，和上面的线程是一一对应的，one loop per thread

    if (callback_) {
        callback_(&loop);
    } {
        std::unique_lock<std::mutex> lock(mutex_);
        loop_ = &loop;
        cond_.notify_one();
    }

    loop.loop(); // EventLoop loop  => Poller.poll
    std::unique_lock<std::mutex> lock(mutex_);
    loop_ = nullptr;
}
